ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2022
·
IF 11.357
Yamin Pan,En Li,Yajie Wang,Chuntai Liu,Changyu Shen,Xianhu Liu
Solar-driven interfacial evaporation is considered to be one of the promising and efficient ways of producing clean water in recent years. However, it remains a challenge to develop solar evaporation devices with high solar evaporation rates and salt-free blocking properties. Here, a porous solar evaporator with directed water transport and salt-free desalination through excellent photothermal conversion and purposefully guided migration of the salt solution was developed. The designed porous photothermal sponge with the synergistic effect of MXene and polypyrrole can achieve evaporation rates of 1.47 and 2.27 kg m–2 h–1, respectively, in the capillary model and siphon model water-transporting solar evaporation devices. More interestingly, the designed zigzag-shaped device with an evaporation rate of 2.45 kg m–2 h–1 was achieved. In addition, the evaporator can operate stably under 9 h in the siphon model solar evaporation device and achieves the effect of salt-free desalination. The above design provides a good strategy for solar-powered desalination applications.
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COLORATION TECHNOLOGY
·
2022
·Vol. 139
·期 1
·45-56
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IF 2.049
Na-won Baek,Dan Wang,Xun Zhang,Jie Wang,Xue-rong Fan
Silk fabrics treated with gallic acid/pyrrole (PGA/PPy) complexes polymerised using horseradish peroxidase have higher electrochemical activity than silk fabrics dyed with gallic acid alone. However, the degree of polymerisation decreases. As a result, the ultraviolet (UV) protection and fastness of the silk fabric were lowered. To solve this problem, we studied the degree of polymerisation of the complex and the functionality of dyed silk fabrics by applying a polyethylene glycol (PEG) template to the enzymatic polymerisation of PGA/PPy. The polymerisation mechanism of the complexes was analysed in detail using UV-visible spectroscopy, Fourier-transform infrared (FTIR) spectroscopy, and high-performance liquid chromatography electrospray ionisation mass spectrometry (HPLC-ESI-MS). Consequently, the PGA/PPy/PEG complex has a higher degree of polymerisation than the PGA/PPy prepared without PEG, indicating that the PEG template can promote the polymerisation of PGA and PPy. As a result, we found that the presence of the PEG template improved the thermal stability and UV protection function of the dyed silk fabric, but did not impair the electrochemical activity of silk fabric. As a result of analysing the colour depth, it exhibited a higher K/S value compared to the dyed silk fabric in the absence of PEG. Additionally, its colour fastness was improved.
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RSC Advances
·
2022
·Vol. 12
·期 31
·20251-20258
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IF 4.036
Ying Yang,Jianbo Yin,Fangsheng Tao,Yunshan Zhou,Lijuan Zhang,Yuxu Zhong,Yong'an Wang
By combining the anionic salt meso-tetra(4-carboxyphenyl)porphyrin (TCPP4−) and the Keggin polyoxometalate cation cluster [Al13O4(OH)24(H2O)12]7+ via a simple ion-exchange method, a hybrid (C48H26N4O8)[Al13O4(OH)24(H2O)12]2(OH)10·18H2O (Al13–TCPP) was prepared and thoroughly characterized as a prototype of polyoxometalate–porphyrin hybrids for the photocatalytic degradation of the mustard gas simulant 2-chloroethyl ethyl sulfide (CEES). The experimental results showed that the catalytic degradation rate of CEES in the presence of Al13–TCPP reached 96.16 and 99.01% in 180 and 90 min in methanol and methanol–water solvent mixture (v/v = 1 : 1), respectively. The reaction followed first-order reaction kinetics, and the half-life and kinetic constant in methanol and solvent mixture were 39.8 min, −0.017 min−1 and 14.7 min, −0.047 min−1. Mechanism analysis indicated that under visible light irradiation in air, CEES was degraded through a combination of oxidation and alcoholysis/hydrolysis in methanol and the methanol–water solvent mixture. The superoxide radical (O2˙−) and singlet molecular oxygen (1O2) generated by Al13–TCPP selectively oxidized CEES into a non-toxic sulfoxide. The singlet oxygen capture experiments showed that Al13–TCPP (Φ = 0.236) had a higher quantum yield of singlet oxygen generation than H4TCPP (Φ = 0.135) under visible light irradiation in air. The material Al13–TCPP has good reusability, and the degradation rate of CEES can still reach 98.37% after being recycled five times.
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JOURNAL OF MEMBRANE SCIENCE
·
2022
·
IF 10.53
Rui Wang,Hong You,Yingjie Zhang,Zhipeng Li,Yi Ding,Qiqing Qin,Han Wang,Jinxu Sun,Yuhong Jia,Feng Liu,Jun Ma,Xiquan Cheng
Electrically conductive membrane, acting as an electrode while separating, has already been demonstrated breakthrough performance in mitigating membrane fouling and improving contaminant removal. However, only a few works have reported about conductive ceramic membranes because of their poor conductivity. Herein, we developed a kind of highly conductive polypyrrole (PPy) coated ceramic membrane (CM) with excellent anti-fouling performance through incorporating graphene oxide (GO)/reduced graphene oxide (rGO). During the process, π-π interactions, hydrogen bond or electrostatic attractions occur between GO/rGO and pyrrole (Py), leading to the adsorption of Py onto the GO/rGO rather than polymerizing directly on membrane surface, which effectively improve the membrane properties such as flux, porosity, hydrophilicity, Zeta potential , and roughness, etc. Particularly, due to the formation of a complete conductive network between PPy and CM with GO/rGO, as well as high conductivity of rGO, the electrical resistivity of PPy membrane was decreased from 8.46 to 3.56 and 0.87 kΩ/cm, respectively. Interestingly, the average specific flux of rGO/PPy (GO/PPy) membrane under electric field was 47.5% (33.6%) higher than that of CM support during yeast filtration, showing strong promise in water remediation. In particular, the extended Derjaguin–Landau–Verwey–Overbeek (XDLVO) theory proved that after introducing GO/rGO into PPy membrane, the enhanced hydrophilicity and Zeta potential, as well as the weakened roughness, led to more positive van der Waals, Lewis acid-base and electrostatic interfacial force, that was, better anti-fouling property, which indicated an extremely bright future in the design of anti-fouling membranes.
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Journal of CO2 Utilization
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2022
·
IF 8.321
Yupeng Chen,Chong Chen,Xue Li,Nengjie Feng,Lei Wang,Hui Wan,Guofeng Guan
Catalytic fixation of greenhouse gas CO 2 into value-added chemicals under mild conditions was deemed as an effective pathway for carbon emissions mitigation, though facing big challenges. Herein, a novel hydroxyl-ionic liquid functionalized metalloporphyrin (ZnTpyp-IL) catalyst bearing hydrogen bond donor (HBD), Lewis acidic and nucleophilic sites was fabricated and invested in the CO 2 cycloaddition without additive or solvent. The integration of ionic liquid endowed the framework with strong surface affinity to enrich CO 2 molecules, while the cooperative interplay of multiple active sites further promoted the high-selective conversion of epichlorohydrin (ECH). Under optimal conditions (100 °C, 1 MPa, 4 h), the yield of corresponding chloropropene carbonate (CPC) reached 97.1 % (turnover frequency (TOF) = 52.4 h -1 ), far superior to that of bare Tpyp (17.4 %). The preliminary kinetic studies revealed the lower activation energy (59.54 kJ/mol) needed to be overcome in the ring-opening process over ZnTpyp-IL. Moreover, a plausible dual-activation mechanism of hydrogen bonds and Zn centers for epoxides was proposed based on the density functional theory calculation (DFT) to explain the acceleration of rate-determining step. Coupled with the satisfactory reusability and substrate expansibility, the developed ZnTpyp-IL demonstrated its great potential as robust heterogeneous catalyst in the efficient utilization of C 1 resource.
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ACS Applied Nano Materials
·
2022
·
IF 6.14
Tanlin Chen,Binbin Wang,Zhaohui Qi,Zihao Guo,Yingrui Tian,Fanbin Meng
In recent years, microwave absorbing (MA) materials have developed rapidly and made good progress. However, MA materials with thin thickness and light weight are still a huge challenge. Furthermore, the application of single-function MA materials is severely restricted due to poor environmental adaptability in actual use, especially in harsh marine environments. Herein, we prepared graphene oxide/chiral polypyrrole hybrid (GO/CPPy) materials, which showed microwave absorbing properties combined with anticorrosion performance, by in situ polymerization. The sheet-layer GO/CPPy was composed of chiral helical polypyrrole and two-dimensional GO sheets. The introduction of chiral polypyrrole not only brought good dielectric loss but also produced additional magnetic loss. As a result, the GO/CPPy hybrids indicated a strong reflection loss (RL) of −55.5 dB at 8.55 GHz with a thickness of 3.8 mm. Meanwhile, they exhibited a broad effective bandwidth of 8.4 GHz from 9.1 to 17.5 GHz. In addition, 0.6% GO/CPPy-EP composite coatings displayed excellent long-term corrosion resistance with a remarkable corrosion protection capability (99.73%) after 21 days of immersion in a corrosive medium. Furthermore, the corresponding 6% GO/CPPy-EP microwave absorbing coatings retained high MA performance with a minimum RL of −27.5 dB at 12.38 GHz, which was tested using a bow reflectivity test system after immersion in 3.5% NaCl solution for 21 days. Moreover, the MA performance dropped only by 13.79%. This work could open new avenues toward the development of MA materials with corrosion protection performance.
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Journal of Materials Chemistry A
·
2022
·Vol. 10
·期 28
·14954-14964
·
IF 14.511
Hao Liu,Haochang Chen,Shunzhe Zhang,Kaifeng Wang,Lei Yang,Yujie Chen,Hezhou Liu,Hua Li
Combining two distinct materials to obtain high-performance electrode materials is a viable solution, but the process is inefficient, taking at least two processes and requiring tens of hours. Here, a unique bipolar pulse electrodeposition process is proposed, which effectively manufactures a composite electrode material with strong synergistic connection between NiCoS and PPy in a single step. Taking advantage of the synergistic impact of the nickel–cobalt sulfide nanoflower structure with a wide electrode–electrolyte contact area, as well as PPy with the appropriate thickness, the composite NiCoS/PPy electrode exhibits a high specific capacitance of 1848.8 F g−1 at a current density of 1 A g−1 and excellent rate performance. Due to the strong-coupling and the protection of the PPy layer, the electrode material possesses ultra-high cycling stability at high current density (96.15% capacitance retention after 10 000 cycles at 10 A g−1). When compared to other typical methods, this approach greatly simplifies the composite electrode material production process, requiring just one step and 2400 seconds, which is hundreds of times faster. Furthermore, an assembled asymmetric supercapacitor (ASC) device of NCS/P-3//activated carbon (AC) achieves a high energy density of 48.79 and 40.21 W h kg−1 at a power density of 750 and 7500 W kg−1, respectively, while maintaining a long cycle-life. It is proved that on the premise of simplifying the preparation process by bipolar pulse electrodeposition, the composite electrode material has excellent electrochemical properties and can be used in high-capacity asymmetric supercapacitors.
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CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Hai Huang,Changmei Lin,Zifeng Hua,Jiajia Guo,Dongdong Lu,Yonghao Ni,Shilin Cao,Xiaojuan Ma
In the era of miniaturization, low-cost, high mechanical stability and lightweight are the pre-requisites for the commercialization of smart-wearable supercapacitors (SCs). For this purpose, light-weight, binder-free, sustainable cellulose based thin-films with conductive polymers such as polypyrrole (PPy) have attained considerable attention. However, the delamination of the conductive materials in sandwich-type structures of SCs, particularly during the cyclic bending process at high current densities, is a great challenge for wearable SCs. To circumvent the problem of delamination of conductive materials, multi-layer forming concept that consists of three sequential steps (forming, pressing and drying) in papermaking technology has inspired us to prepare mechanically ultra-stable paper electrodes towards for wearable SCs. For this reason, we firstly adopted the multi-layer concept to design all-in-one paper flexible SCs by integrating PPy-modified cellulose fibers as electrodes, and un-modified cellulose paper as a separator. More importantly, a cocklebur like structure of PPy-modified cellulose fiber has been attained by the virtue of the strong inter-molecular hydrogen bonding between free hydroxyl groups on the surface cellulose fibers and PPy, resulting in increased PPy loading, and thus enhancing the electrochemical properties of the all-in-one paper supercapacitor . Furthermore, these hydroxyl groups facilitate the inter-layer bonding of the paper structure in the subsequent pressing and drying processes, favoring the integration of the electrodes and separator. Benefiting from the multi-layer forming concept and suitable morphology of PPy- modified cellulose, we have prepared an ultra-thin (150 μm) all-in-one paper SC with high areal specific capacitance (up to 562 mF cm −2 ), high energy density (up to 3.1 mWh cm −3 ) and high-power density (up to 414.9 mW cm −3 ). Moreover, the all-in-one paper SC shows excellent flexibility, with negligible specific capacitance loss by bending at 0° to 180° angles after repeating 1000 times. The proposed concept and supercapacitor fabrication process is scalable and can be readily implemented in a modern paper industry.
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JOURNAL OF HAZARDOUS MATERIALS
·
2022
·
IF 14.224
Yaqin Rong,Wenjun Yan,Zhongde Wang,Xiaogang Hao,Guoqing Guan
Contact with trace heavy metal contaminants will also lead to extremely bad health influence on human body and aquatic life. Although various adsorbents have been synthesized for the recovery of heavy metal ions , most of them shows deficient adsorption capacity, sluggish uptake rate and low selectivity . In this study, a montmorillonite/polypyrrole (MMT/PPy) film was successfully synthesized by intercalating polymers PPy into the interlayer of MMT nanosheets for selective and rapid capture of Pb 2+ . The electroactive film has ultrahigh uptake capacity (1373.29 mg⋅g −1 ), which is much higher than most conventional Pb 2+ adsorbents. Meanwhile, it had an extreme selectivity towards Pb 2+ due to the MMT/PPy film can accurately identified Pb 2+ . Through characterization testing and data analysis, the selective and rapid uptake/release of Pb 2+ should be realized through three ways: (1) negatively-charged laminates of MMT can generate electrostatic attraction to Pb 2+ ; (2) -OH on the surface of MMT laminates can accurately identified and bonded with Pb 2+ (M-O-H↔ M-O-Pb); (3) PPy doped by PSS n- and protic acid can rapidly catch Pb 2+ (PPy + ·PSS n- +Pb 2+ +e - → PPy·PSS n- ·Pb 2+ ). Therefore, such a novel MMT/PPy nanocomposite film could has evident application prospect to remove Pb 2+ from various water bodies.
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EUROPEAN POLYMER JOURNAL
·
2022
·
IF 5.546
Ruiyuan Wang,Qingquan Liu,Qi Peng,Xiaoyu Yang,Hongwei Zhao,Hui Fan,Huan Liu,Xinxiu Cao
Porous organic polymers (POPs) have potential applications in gas capture and storage to solve the challenges including decreasing the emission of greenhouse gases and storing green energies. However, they mainly rely on the surface of pores to adsorb gas molecules, and the inner space of the pores is underutilized. Herein, we synthesized two azo-bridged porphyrin POPs with a linear (PPAPP) and bent (PDAPP) backbone, respectively. The Fourier transform infrared (FT‐IR) spectra and the element content analysis shows that the extent of reaction of PPAPP is higher than that of PDAPP. The Brunauer-Emmett-Teller surface area of PPAPP is almost 4 times higher than that of PDAPP. Nevertheless, the CH 4 and CO 2 uptake capacity of PDAPP is equal to or higher than that of PPAPP. The reason for this is that PDAPP contains many traps. Traps with a large inner space and small sized doors could act as mazes for gas molecules. Gas molecules could enter the traps, but it is hard to get out of them. As a result, traps could act as containers for gas molecules. Our research suggests that POPs with traps are potential high-efficiency gas uptake materials because the inner space of the pores could be utilized.
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CARBOHYDRATE POLYMERS
·
2022
·
IF 10.723
Yan Sun,Yuan Yang,Lingling Fan,Wenfeng Zheng,Dezhan Ye,Jie Xu
Polypyrrole (PPy)/bacterial cellulose (BC) composite membranes are a promising kind of lightweight and flexible electrodes for supercapacitors . Herein, we explored a facile and efficient electrostatic self-assembly approach to uniformly depositing anion-doped PPy onto positively charged SnCl 2 -modifed BC (SBC). The obtained PPy@SBC electrode exhibited a high areal capacitance of 5718 mF cm −2 at a current density of 0.5 mA cm −2 , a desirable capacitance retention of 83.1% at 5.0 mA cm −2 and excellent cycling stability (a capacitance retention of 86.8% after 10,000 cycles at 10 mA cm −2 ). A symmetric flexible supercapacitor was further assembled with the PPy@SBC electrodes, which delivered outstanding mechanical flexibility with negligible capacitance decay under different bent states. This study shows impressive potential in fabricating high-performance electrodes for flexible supercapacitors.
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MACROMOLECULAR RAPID COMMUNICATIONS
·
2022
·Vol. 43
·期 20
·2200347
·
IF 5.006
Chen Zhao,Tao Wan,Wenxiong Yuan,Zhaoqiang Zheng,Xiaoteng Jia,Kewei Shu,Lei Feng,Yonggang Min
Yarn supercapacitors have attracted significant attention for wearable energy storage due to their ability to be directly integrated with garments. Conducting polymer polypyrrole (PPy) based yarn supercapacitors show limited cycling stability because of the huge volume changes during the charge–discharge processes. In addition, laundering may cause damage to such yarn supercapacitors. Here, the fabrication of PPy-based re-stickable yarn supercapacitors is reported with good cycling stability by employing vapor phase polymerization (VPP) and water-soluble polyethylene oxide (PEO) film as the adhesive layer. VPP duration and cycle are controlled to achieve multi-layered PPy electrodes. The assembled yarn supercapacitors show a good cycling stability with capacitance retention of 79.1% after 5000 charge–discharge cycles. The energy stored in the yarn supercapacitor is sufficient to power a photodetector. After gluing the yarn supercapacitors onto a PEO film, the devices can be stunk on and peeled off the garment to avoid the mechanical stresses during the washing process. Three yarn supercapacitors connected in parallel on PEO film show negative changes in electrochemical performance after 5 sticking-peeling cycles. This work provides a facile way to fabricate PPy-based re-stickable energy storage devices with high cycling stability for smart garments.
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危险品化学品经营许可证（带存储）